Update net-istio nightly (#11498)
Update net-istio nightly (#11498)

bumping knative.dev/net-istio 542899c...6f64f4c:
  > 6f64f4c Bump k8s version in kind-e2e.yaml to v1.19, 1.20 and 1.21 (# 665)
  > 3df5559 drop use of knative.dev/pkg/test.KubeClient (# 664)
  > 40723d7 upgrade to latest dependencies (# 663)

Signed-off-by: Knative Automation <f415700d4d0ce1c81810fe7553e3eea2bed16231@knative.team>
knative/serving,knative/serving